Behind the Scene of “The Holy Family with St. Anne and the Young St. John” by Bernardino Luini: A Computer-Assisted Method to Unveil the Underdrawings

Year: 2021

Authors: Caccia M., Bonizzoni L., Martini M., Fontana R., Villa V., Galli A.

Autors Affiliation: 1. Dipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, Milano, Italy 2. INFN, Sezione Milano-Bicocca, Italy 3. Dipartimento di Fisica Aldo Pontremoli, Università degli Studi di Milano, Milano, Italy 4. CNR-INO Istituto Nazionale di Ottica, Firenze, Italy 5. Cultura Valore, Varese, Italy 6. CNR-IBFM Istituto di Bioimmagini e Fisiologia Molecolare, Segrate, Italy

Abstract: Uncovering the underdrawings (UDs), the preliminary sketch made by the painter on the grounded preparatory support, is a keystone for understanding the painting´s history including the original project of the artist, the pentimenti (an underlying image in a painting providing evidence of revision by the artist) or the possible presence of co-workers´ contributions. The application of infrared reflectography (IRR) has made the dream of discovering the UDs come true: since its introduction, there has been a growing interest in the technology, which therefore has evolved leading to advanced instruments. Most of the literature either report on the technological advances in IRR devices or present case studies, but a straightforward method to improve the visibility of the UDs has not been presented yet. Most of the data handling methods are devoted to a specific painting or they are not user-friendly enough to be applied by non-specialized users, hampering, thus, their widespread application in areas other than the scientific one, e.g., in the art history field. We developed a computer-assisted method, based on principal component analysis (PCA) and image processing, to enhance the visibility of UDs and to support the art-historians and curators´ work. Based on ImageJ/Fiji, one of the most widespread image analysis software, the algorithm is very easy to use and, in principle, can be applied to any multi- or hyper-spectral image data set. In the present paper, after describing the method, we accurately present the extraction of the UD for the panel “The Holy Family with St. Anne and the Young St. John” and for other four paintings by Luini and his workshop paying particular attention to the painting known as “The Child with the Lamb”.

Journal/Review: APPLIED SPECTROSCOPY

Volume: 75 (3)      Pages from: 274  to: 286

More Information: The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by Fondazione Cariplo, grant no. 2016-2146. Financial support by the Access to Research Infrastructures activity in the Horizon 2020 Programme of the EU (IPERION CH Grant agreement 654028) is gratefully acknowledged.
KeyWords: Infrared reflectography, underdrawings, image processing, Bernardo Luini
DOI: 10.1177/0003702820949928

Citations: 3
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